Renovations at the Barneys store in Chelsea have been a nine-month pain in the “gas,” according to neighbors who live above the shopping mecca.

The high-end department-store chain, which offers $36,000 crocodile designer satchels and $28,900 fur coats, will open a second flagship on Seventh Avenue and 16th Street on Monday — and even offered co-op residents living above the new location gift baskets when contractors began work a year ago.

On May 18, 2015, Barney’s workers discovered a suspicious gas pipe and alerted ConEd, which cut gas to the co-op’s 155 units. Wary of a gas explosion that leveled three East Village buildings a month before, neighbors shrugged off the disruption and accepted hot plates that Barney’s distributed.

But delays in restoring gas service dragged on for months. Contractors ripped out walls and moved cabinets to test pipes for leaks.

ConEd spokesman Allan Drury said workers “discovered a connection and valve that had been installed without authorization.”

Forty-nine apartments in the 18-story Art Deco building still can’t use their stoves, according to a notice the co-op board sent to residents this week.

United Management Corporation’s David Kastner, who manages the building, did not return a call seeking comment.